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Circulatory System
The Human Body

Circulatory System

Circulatory System
Reading Level
     edHelper's suggested reading level:   grades 7 to 8
     Flesch-Kincaid grade level:   6.99

Vocabulary
     challenging words:    aorta, cava, stopover, rubbery, nonstop, pumped, dioxide, carbon, capillary, cargo, plasma, respiratory, regulate, constant, useful, itself

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Circulatory System
By Sharon Fabian 		  
1     Blood circulates through your body all the time through a complicated system of large and small pathways. Your heart pumps day and night to transport the blood on its nonstop journey. This is your circulatory system, and it is in constant motion for a very good reason. Your circulatory system is like the freight train that delivers essential supplies to wherever they are needed in your body.
 
2     As blood travels to all parts of your body, it delivers food and oxygen to your cells. It removes carbon dioxide and other waste materials. Along the way, it also helps to regulate your body temperature.
 
3     The center of your circulatory system is your heart. It is a hollow muscle with two side-by-side pumps. When you are resting, your heart pumps about 70 times each minute. When you are exercising, it pumps even more. The pump on the right side sends a supply of blood to your lungs. The pump on the left side sends blood to all other parts of your body.

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